Catechol-O-Methyltransferase Polymorphism and Endometriosis

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This case-control study investigated whether a COMT gene polymorphism associated with low enzyme activity is linked to endometriosis risk in women.

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This case-control study evaluated whether a COMT exon 4 valine-to-methionine polymorphism (low-activity allele COMT-L) is associated with endometriosis by genotyping women with surgically and histologically confirmed endometriosis (n=91) and women without evidence of endometriosis confirmed by laparoscopy or laparotomy (n=92). Allele frequencies for COMT-L were identical in cases and controls (0.50 vs 0.50; p=0.999; odds ratio 1.0, 95% CI 0.66–1.51), indicating no association between this COMT polymorphism and endometriosis risk. A key limitation is that the study tests a single genetic variant as a proxy for COMT activity and does not report broader genetic, biochemical, or functional measures of catechol-estradiol metabolism beyond genotype. This paper is centrally about endometriosis — it directly tests COMT polymorphism association with surgically confirmed disease.

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Abstract

PurposeCatechol-O-methyltransferase (COMT) inactivates the estradiol metabolites, 2-hydroxy and 4-hydroxy catechols, which have been implicated in the pathogenesis of endometriosis. A COMT valine to methionine polymorphism (G-to-A) in exon 4 of the COMT gene is polymorphic in the human population, with 25% of Caucasians being homozygous for the low-activity allele (COMT-L) of the enzyme. In a case-control study we investigated whether this COMT polymorphism is associated with endometriosis.MethodsPolymerase chain reaction was performed to analyze the COMT genotype among women with surgically and histologically confirmed endometriosis (study group; n = 91) and in women without evidence of endometriosis confirmed by laparoscopy or laparotomy (control group; n = 92).ResultsAllele frequencies for the low-activity allele (COMT-L) among women with endometriosis and controls were 0.50 and 0.50, respectively (p = 0.999; odds ratio = 1.0, 95% CI: 0.66-1.51).ConclusionsOur results suggest that the valine to methionine polymorphism in exon 4 of the COMT gene is not associated with the risk of endometriosis compared to a surgical control population.
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Abstract

Purpose : Catechol-O-methyltransferase (COMT) inactivates the estradiol metabolites, 2-hydroxy and 4-hydroxy catechols, which have been implicated in the pathogenesis of endometriosis. A COMT valine to methionine polymorphism (G-to-A) in exon 4 of the COMT gene is polymorphic in the human population, with 25% of Caucasians being homozygous for the low-activity allele (COMT-L) of the enzyme. In a case-control study we investigated whether this COMT polymorphism is associated with endometriosis.

Methods

Polymerase chain reaction was performed to analyze the COMT genotype among women with surgically and histologically confirmed endometriosis (study group; n = 91) and in women without evidence of endometriosis confirmed by laparoscopy or laparotomy (control group; n = 92).

Results

Allele frequencies for the low-activity allele (COMT-L) among women with endometriosis and controls were 0.50 and 0.50, respectively (p = 0.999; odds ratio = 1.0, 95% CI: 0.66–1.51).

Conclusions

Our results suggest that the valine to methionine polymorphism in exon 4 of the COMT gene is not associated with the risk of endometriosis compared to a surgical control population. Similar content being viewed by others

References

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endometriosis

MeSH descriptors

Catechol O-Methyltransferase Endometriosis Polymorphism, Genetic Adolescent Adult Aged Amino Acid Substitution Catechol O-Methyltransferase Endometriosis Endometriosis Endometriosis Female Humans Middle Aged

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